The 10 best Portal 2 co-op maps

We recently gave you our selection of the best Portal 2 single player maps and campaigns available on the Steam Workshop. There's some great feats of level design in that list, but if you really want to see mapmakers skills stretched to the limit, you have to turn to co-op.

With two brains and four portals available, the levels must be exponentially more complicated. They need to emphasise teamwork, provide an inventive challenge and be tightly crafted so as to stop players exploiting their way through. With that in mind, I enlisted the help of my Perpetual Testing Partner to dig out the ten best co-operative maps around. As always, if you've a favourite that's not listed, let us know about it.

1. Six Extra Seconds of Trust

The title refers to this Cave Johnson sales pitch for co-operating robots. It's apt: Six Extra Seconds of Trust takes place in a room full of buttons and switches, with each player on either side of a glass wall, trying to figure out how to help the other. The work gone into creating such a labyrinthian series of connections is truly impressive. Download Six Extra Seconds of Trust here .

Notes from the Testing Partner: "I've got it! Just take that cube to... wait... no. That won't work for all sorts of reasons"

2. Buttons, Elevators and Goo

...And funnels, lasers, jumping puzzles, blind leaps of faith and those damn emancipation grids. B,E&G contains a large room full of corridors and side-chambers, each concealing a cube needed to complete a collection of buttons. Each area contains or requires a different puzzle element, and its the variety of challenges and their enjoyable solutions that make this a great map. Download Buttons, Elevators and Goo here .

Notes from the Testing Partner: "NOOoooooo..! *splash* Balls."

3. Camtasia

A clever little chamber comprised of two rooms, one on top of the other. While neither player can reach the other directly, laser guarded holes in the ground allow you to share the limited resources back and forth, and buttons allow you to deactivate obstacles in your partners way. There's not much portalling to be done, but co-ordination and teamwork are still key. Download Camtasia here .

Notes from the Testing Partner: "I'm stuck in this hole again. :("

4. Fortunate Buttons

A super-contained single room challenge with plenty of black walls blocking your progress. Fortunate Buttons is an order of sequence puzzle in which every step seemingly throws in more complications and leaps of logic as you move towards your solution. It always feels like you're on the edge between completion and completely messing it all up as you attempt to stretch a limited number of cubes further than seems possible. Download Fortunate Buttons here .

5. There's No I in Team, 01

Part of a series of co-op maps made by mapmaker LPChip. Part one starts with a tricky excursion funnel challenge that requires you to really think through the positioning of each player before you make a move. But it's the finale, in which you share a sphere back and forth between each other, that really exemplifies the "accidental" comic slapstick at the heart of the the best Portal 2 co-op maps. Download There's No I in Team here .

Notes from the Testing Partner: "I know how to do this! I have to die!"